The output is what I wanted and I apologise for not pasting in the opening lines of a longer script.

I have a string of letters, e.g. 'ABCDEF'. I want to insert the letter 'N' into each position so I can end up with:

NABCDEF
ANBCDEF
ABNCDEF
...
ABCDEFN

At other times I'll need to insert a second N into the string, which is the output given in a previous post:

NNABCDEF
NANBCDEF
...
ABCDEFNN

Whether I need one or two iterations is controled by an input that we can call $num.

I can do this insertion for one instance and also for two instances, but I've written them as two sets of code. I'm wondering if there's a way to do it in once block of code.

many thanks